<template>
  <li>
    <label>
      <input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
      <span v-show="!todo.isEdit">{{ todo.title }}</span>
      <input ref="inputTitle" v-show="todo.isEdit" type="text" :value="todo.title" @blur="handleBlur(todo,$event)">
    </label>
    <button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
    <button v-show="!todo.isEdit" class="btn btn-edit" @click="handleEdit(todo)">编辑</button>
  </li>
</template>

<script>
export default {
  name: "MyItem",
  props: ['todo', 'checkTodo', 'deleteTodo'],
  methods: {
    handleCheck(id) {
      this.checkTodo(id);
    },
    handleDelete(id) {
      if (confirm('确定删除么？')) {
        this.deleteTodo(id);
      }
    },
    handleEdit(todo) {
      // todo.isEdit = true;
      if (todo.hasOwnProperty.call('isEdit')) {
        // todo身上已经有isEdit直接修改
        todo.isEdit = true;
      } else {
        this.$set(todo, 'isEdit', true);
      }
      // 在dom节点更新完毕之后才执行回调
      this.$nextTick(() => {
        this.$refs.inputTitle.focus();
      });
    },
    handleBlur(todo, e) {
      todo.isEdit = false;
      if (e.target.value.trim()) {
        this.$bus.$emit('updateTodo', todo.id, e.target.value);
      } else {
        alert('不能为空');
        return;
      }
    }
  }
}
</script>

<style scoped>
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  /*float: left;*/
  cursor: pointer;
}

li span {
  margin-left: 10px;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}

li:hover {
  background-color: #ddd;
}

li:hover button {
  display: block;
}
</style>